213162421 has 2 divisors, whose sum is σ = 213162422. Its totient is φ = 213162420.

The previous prime is 213162379. The next prime is 213162431. The reversal of 213162421 is 124261312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178222500 + 34939921 = 13350^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 213162421 - 2¹³ = 213154229 is a prime.

It is a super-3 number, since 3×213162421³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213162392 and 213162401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213162431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106581210 + 106581211.

It is an arithmetic number, because the mean of its divisors is an integer number (106581211).

Almost surely, 2^213162421 is an apocalyptic number.

It is an amenable number.

213162421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213162421 is an equidigital number, since it uses as much as digits as its factorization.

213162421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 213162421 is about 14600.0829107235. The cubic root of 213162421 is about 597.3610220463.

The spelling of 213162421 in words is "two hundred thirteen million, one hundred sixty-two thousand, four hundred twenty-one".